Perhaps explain what you want to accomplish. What do the two menu's represent?
Now an answer based on what I assume you want:
You could make two pages that each contain one of the two lists of pages. I assumed one menu has normal pages like home and contact. The other navigation menu I made up is for products that you want to display.
Code:
TL_ROOT
+ Domain root page
+ General pages
+ Home
+ Info
+ Contact
+ Products
+ Product 1
+ Product 2
+ Product x
If you add two normal navigation modules to the theme you can limit each one to a range of pages. (Set a reference page). Clearly one would use "General pages" as reference and the other would use "Products" as the reference.
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